Abstract: Liquor wastewater sludge-based biochar（LWSB） was prepared from liquor wastewater sludge（LWS）. The static adsorption experiment was used to study the effects of different initial pH, adsorption dosage, adsorption time, initial mass concentration and temperature on methylene blue （MB） adsorption by LWSB. The adsorption mechanism of MB by LWSB was investigated by brunauer-emmett-teller（BET） surface area, scanning electron microscope（SEM）, X-ray photoelectron spectroscopy（XPS） and fourier transform infrared spectroscopy（FTIR）. The results showed that compared with LWS, the specific surface area and pore volume of LWSB increased significantly, while the average pore size decreased. Under the condition of initial pH of 8, dosage of 1.0 mg/L, adsorption time of 360 min and temperature of 44.85 ℃, the theoretical maximum adsorption capacity was 213.86 mg/g. It was found that MB adsorption by LWSB fitted well the pseudo-second order kinetics model, and can be well described by the Redlich-Peterson isotherm model. The adsorption of MB by LWSB was a process of spontaneous, endothermic, entropy increasing process. The mechanism between LWSB and MB involved electrostatic interaction, hydrogen bonding, complexation, π-π, n-π interaction, etc.

Key words: liquor wastewater sludge-derived biochar, methylene blue, adsorption kinetics, thermodynamics, mechanism